Chemistry and Physics of Materials Unit (CPMU): Recent submissions

Now showing items 461-480 of 500

Rotational Diffusion of a New Large Non Polar Dye Molecule in Alkanes

Goudar, Radha; Gupta, Ritu; Kulkarni, G. U.; Inamdar, Sanjeev R. (Springer/Plenum Publishers, 2015)

Rotational reorientation times of a newly synthesized 2,5-bis(phenylethynyl)1,4-bis(dodecyloxy) benzene (DDPE) are experimentally determined in series of n-alkanes by employing steady state and time resolved fluorescence ...
Towards low cost materials and methods for transparent electrodes

Kulkarni, G. U.; Kiruthika, S.; Gupta, Ritu; Rao, K. D. M. (Elsevier Science Ltd, 2015)

A transparent electrode is a key component of any optoelectronic or transparent device. With increasing number of large area applications, there is growing demand to replace the conventional oxide based transparent conducting ...
Facet selective etching of Au microcrystallites

Mettela, Gangaiah; Kulkarni, G. U. (Tsinghua Univ Press, 2015)

High-symmetry crystals exhibit isotropic properties. Inducing anisotropy, e.g., by facet selective etching, is considered implausible in face-centered cubic (FCC) metals, particularly gold, which, in addition to being an ...
Viscoelastic nature of Au nanoparticle-PDMS nanocomposite gels

Gupta, Ritu; Nagamanasa, Hima K.; Ganapathy, Rajesh; Kulkarni, G. U. (Indian Academy of Sciences, 2015)

A stable gel of Au nanoparticles in polydimethylsiloxane (PDMS) nanocomposite is prepared by employing the curing agent of PDMS elastomer as a reducing agent for the formation of Au nanoparticles by an in-situ process. The ...
Transparent Metal Network with Low Haze and High Figure of Merit applied to Front and Back Electrodes in Semitransparent ITO-free Polymer Solar Cells

Hunger, Christoph; Rao, K. D. M.; Gupta, Ritu; Singh, Chetan R.; Kulkarni, G. U.; Thelakkat, Mukundan (Wiley-V C H Verlag Gmbh, 2015)

In the quest for indium-tin oxide (ITO)-free photovoltaics and for building integrated as well as automobile roof applications, novel transparent electrodes for both front and back electrodes are required. Here we report ...
Site selective Cu deposition on Au microcrystallites: corners, edges versus planar surfaces

Mettela, Gangaiah; Kulkarni, G. U. (Royal Society of Chemistry, 2015)

Among epitaxially grown metal over metal systems, Cu on a Au surface forms a notable exception given the large lattice mismatch (similar to 11.2%). Although widely observed, Cu growth on Au is less understood at both nano ...
Solution processed nanomanufacturing of SERS substrates with random Ag nanoholes exhibiting uniformly high enhancement factors

Gupta, Ritu; Siddhanta, Soumik; Mettela, Gangaiah; Chakraborty, Swati; Narayana, Chandrabhas; Kulkarni, G. U. (Royal Society of Chemistry, 2015)

Achieving high Raman enhancement (SERS) that is relatively uniform over a large substrate area has been a major challenge in nanomanufacturing, as enhancement is localized around a plasmonic hotspot and hotspots are not ...
Fabrication of Oxidation-Resistant Metal Wire Network-Based Transparent Electrodes by a Spray-Roll Coating Process

Kiruthika, S.; Gupta, Ritu; Anand, Aman; Kumar, Ankush; Kulkarni, G. U. (American Chemical Society, 2015)

Roll and spray coating methods have been employed for the fabrication of highly oxidation resistant transparent and conducting electrodes (TCEs) by a simple solution process using crackle lithography technique. We have ...
Shining light on clay-chromophore hybrids: layered templates for accelerated ring closure photo-oxidation

Jain, Ankit; Achari, Amritroop; Mothi, Nivin; Eswaramoorthy, M.; George, Subi J. (Royal Society of Chemistry, 2015)

Templates with specific microenvironments have been long employed to facilitate specialized reactions. From enzymes to metal organic frameworks (MOFs), various systems have exerted their prowess to affect specific chemical ...
Controlled synthesis of tunable nanoporous carbons for gas storage and supercapacitor application

Jayaramulu, Kolleboyina; Datta, Kasibhatta Kumara Ramanatha; Shiva, Konda; Bhattacharyya, Aninda J.; Eswaramoorthy, M.; Maji, Tapas Kumar (Elsevier Science Bv, 2015)

A simple methodology has been developed for the synthesis of functional nanoporous carbon (NPC) materials using a metal-organic framework (IRMOF-3) that can act as a template for external carbon precursor (viz, sucrose) ...
Reversible control of pore size and surface chemistry of mesoporous silica through dynamic covalent chemistry: philicity mediated catalysis

Singh, Dheeraj Kumar; Kumar, B. V. V. S. Pavan; Eswaramoorthy, M. (Royal Society of Chemistry, 2015)

Here, we report the synthesis of adaptive hybrid mesoporous silica having the ability to reconfigure its pore properties such as pore size and philicity in response to the external environment. Decyl chains were reversibly ...
Revealing the trehalose mediated inhibition of protein aggregation through lysozyme-silver nanoparticle interaction

Siddhanta, Soumik; Barman, Ishan; Narayana, Chandrabhas (Royal Society of Chemistry, 2015)

We propose a facile and robust carbohydrate-mediated method for the prevention of nanoparticle induced denaturation and aggregation of proteins. Using label-free plasmon-enhanced Raman spectroscopy measurements, the ...
Highly Decoupled Graphene Multilayers: Turbostraticity at its Best

Mogera, Umesha; Dhanya, Radhakrishnan; Pujar, Rajashekhar; Narayana, Chandrabhas; Kulkarni, G. U. (American Chemical Society, 2015)

The extraordinary properties of graphene are truly observable when it is suspended, being free from any substrate influence. Here, a new type of multilayer graphene is reported wherein each layer is turbostratically ...
Nano-morphology induced additional surface plasmon resonance enhancement of SERS sensitivity in Ag/GaN nanowall network

Sharvani, S.; Upadhayaya, Kishor; Kumari, Gayatri; Narayana, Chandrabhas; Shivaprasad, S. M. (IOP Publishing Ltd, 2015)

The GaN nanowall network, formed by opening the screw dislocations by kinetically controlled MBE growth, possesses a large surface and high conductivity. Sharp apexed nanowalls show higher surface electron concentration ...
Dielectric and Raman investigations of structural phase transitions in (C2H5NH3)(2)CdCl4

Yadav, Ruchika; Swain, Diptikanta; Kundu, Partha P.; Nair, Harikrishnan S.; Narayana, Chandrabhas; Elizabeth, Suja (Royal Society of Chemistry, 2015)

Temperature-dependent Raman and dielectric measurements have been carried out on (C2H5NH3)(2)CdCl4 single crystals. Raman studies reveal the presence of two structural phase transitions below room temperature at 216 K and ...
Effect of pore occupancy on the acoustic properties of zeolitic imidazolate framework (ZIF)-8: A Brillouin spectroscopic study at ambient and low temperatures

Radhakrishnan, Dhanya; Narayana, Chandrabhas (American Institute of Physics, 2015)

Brillouin spectroscopy is used to study the effect of pore occupancy on the elastic constants by incorporating various guest molecules into zeolitic imidazolate framework (ZIF)-8. A systematic study on the effect of mass ...
Stress states in individual Si particles of a cast Al-Si alloy: Micro-Raman analysis and microstructure based modeling

Joseph, Sudha; Kumar, S.; Bhadram, Venkata Srinu; Narayana, Chandrabhas (Elsevier Science Sa, 2015)

The stress states in Si particles of cast Al-Si based alloys depend on its morphology and the heat treatment given to the alloy. The Si particles fracture less on modification and fracture more in the heat treated condition. ...
Acoustic phonon behavior of PbWO4 and BaWO4 probed by low temperature Brillouin spectroscopy

Kavitha, C.; Narayana, Chandrabhas; Ramachandran, B. E.; Garg, Nandini; Sharma, Surinder M. (Pergamon-Elsevier Science Ltd, 2015)

Temperature dependent acoustic phonon behavior of PbWO4 and BaWO4 using Brillouin spectroscopy has been explained for the first time. Low temperature Brillouin studies on PbWO4 and BaWO4 have been carried out from 320-20 ...
How Far Can We Probe by SERS?

Kumari, Gayatri; Kandula, Jyothirmayee; Narayana, Chandrabhas (American Chemical Society, 2015)

Surface-enhanced Raman spectroscopy (SERS) has gained paramount importance in the recent past due to its widespread applications in biodetection, monitoring chemical reactions, small molecule protein interactions, etc. It ...
Comparative high pressure Raman studies on perfluorohexane and perfluoroheptane

Kavitha, C.; Narayana, Chandrabhas (Pergamon-Elsevier Science Ltd, 2015)

High pressure Raman spectroscopic studies on perfluorohexane and perfluoroheptane have performed up to 12 GPa. Perfluorohexane under goes two pressure induced transitions: (1) liquid-solid transition at 1.6 GPa and (2) ...

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